alternate ntp: persist show-search-provider-logo option at chrome://instant

chrome/browser/ui/webui/instant_ui.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_INSTANT_UI_H_
 #define CHROME_BROWSER_UI_WEBUI_INSTANT_UI_H_
 
 #include "content/public/browser/web_ui_controller.h"
 
+class PrefService;
+
+namespace content {
+class BrowserContext;
+}
+
 // Provides configuration options for Instant web search.
 class InstantUI : public content::WebUIController {
  public:
   // Constructs an instance using |web_ui| for its data sources and message
   // handlers.
   explicit InstantUI(content::WebUI* web_ui);
 
   // Returns a scale factor to slow down Instant animations.
   static int GetSlowAnimationScaleFactor();
 
   // Returns true if search provider logo should be shown.
-  static bool ShouldShowSearchProviderLogo();
+  static bool ShouldShowSearchProviderLogo(
+      content::BrowserContext* browser_context);
+
+  static void RegisterUserPrefs(PrefService* user_prefs);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(InstantUI);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_INSTANT_UI_H_